package cn.lyd.interceptor;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//自定义拦截器类
@Component//把拦截器交给spring去管理
public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
       //从session读取用户信息
        Object info = request.getSession().getAttribute("INFO");
        if (info!=null){//用户信息存在
            //放行
            return true;
        }else {
            //不放行，返回登录页
            response.sendRedirect("/system/login");
            return false;
        }
    }
}
